MTPyroger/pyrogram/methods/messages/get_history.py

#  Pyrogram - Telegram MTProto API Client Library for Python
#  Copyright (C) 2017-2020 Dan <https://github.com/delivrance>
#
#  This file is part of Pyrogram.
#
#  Pyrogram is free software: you can redistribute it and/or modify
#  it under the terms of the GNU Lesser General Public License as published
#  by the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  Pyrogram is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU Lesser General Public License for more details.
#
#  You should have received a copy of the GNU Lesser General Public License
#  along with Pyrogram.  If not, see <http://www.gnu.org/licenses/>.

import logging
from typing import Union, List

from pyrogram import raw
# from pyrogram import types
from pyrogram import utils
from pyrogram.scaffold import Scaffold

log = logging.getLogger(__name__)


class GetHistory(Scaffold):
    async def get_history(
        self,
        chat_id: Union[int, str],
        limit: int = 100,
        offset: int = 0,
        offset_id: int = 0,
        offset_date: int = 0,
        reverse: bool = False
    ) -> List["types.Message"]:
        """Retrieve a chunk of the history of a chat.

        You can get up to 100 messages at once.
        For a more convenient way of getting a chat history see :meth:`~pyrogram.Client.iter_history`.

        Parameters:
            chat_id (``int`` | ``str``):
                Unique identifier (int) or username (str) of the target chat.
                For your personal cloud (Saved Messages) you can simply use "me" or "self".
                For a contact that exists in your Telegram address book you can use his phone number (str).

            limit (``int``, *optional*):
                Limits the number of messages to be retrieved.
                By default, the first 100 messages are returned.

            offset (``int``, *optional*):
                Sequential number of the first message to be returned. Defaults to 0 (most recent message).
                Negative values are also accepted and become useful in case you set offset_id or offset_date.

            offset_id (``int``, *optional*):
                Pass a message identifier as offset to retrieve only older messages starting from that message.

            offset_date (``int``, *optional*):
                Pass a date in Unix time as offset to retrieve only older messages starting from that date.

            reverse (``bool``, *optional*):
                Pass True to retrieve the messages in reversed order (from older to most recent).

        Returns:
            List of :obj:`~pyrogram.types.Message` - On success, a list of the retrieved messages is returned.

        Example:
            .. code-block:: python

                # Get the last 100 messages of a chat
                app.get_history("pyrogramchat")

                # Get the last 3 messages of a chat
                app.get_history("pyrogramchat", limit=3)

                # Get 3 messages after skipping the first 5
                app.get_history("pyrogramchat", offset=5, limit=3)
        """

        offset_id = offset_id or (1 if reverse else 0)

        messages = await utils.parse_messages(
            self,
            await self.send(
                raw.functions.messages.GetHistory(
                    peer=await self.resolve_peer(chat_id),
                    offset_id=offset_id,
                    offset_date=offset_date,
                    add_offset=offset * (-1 if reverse else 1) - (limit if reverse else 0),
                    limit=limit,
                    max_id=0,
                    min_id=0,
                    hash=0
                )
            )
        )

        if reverse:
            messages.reverse()

        return messages